I've seen on many commerical jobs that an engineer will spec two PRV's side-by-side with the main splitting to each of them, then Teeing back together. I was told this is to keep up volume.: : : : I have had some floor damage due to a leak tht would occur when the pressure peaked in my area ususally in early morning or afternoon while I was asleep or at work. I found that my pressure reducer valve had evidently failed. I installed a gauge on a faucet and found that the pressure in early morning was going up to 160PSI. The water company said that the main line at my house sometimes has 230 PSI. I put in a new reducer (Watts N250B) and it holds most of the time at about 53PSI without any adjustment. The literature with the Watts said it will handle pressure up to 250PSI. Overnight, pressure peaks at around 60-65PSI with the new valve. I noted that the Watts website recommended two PRV with high pressure. Would that really be beneficial and extend the life of the PRV? My last one lasted less than four years. I have not adjusted the new PRV as some folks have said you should not monkey with the factory settings. Is it okay to try to reduce the pressure forward or would fiddling with the adjustment cause some problem with the PRV? Do I still need to keep ther pressure reduction tank as I may run into a problem with space if I install another PRV? Thanks.

: The purpose of 2 PRVs is not to extend the life of one. It is to reduce the chance of a catastrophic leak due to a PRV failure--if the first fails, the second is there. You still need an expansion tank. However, these are usually installed at the water heater location and the PRVs are usually located on the main line.: Deb: The Pipewench